projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | menu "Kernel hacking" |
| 2 | ||
| 3 | source "lib/Kconfig.debug" | |
| 4 | ||
| 5 | config EARLY_PRINTK | |
| 6 | bool "Early printk" if EMBEDDED && DEBUG_KERNEL | |
| 7 | default y | |
| 8 | help | |
| 9 | Write kernel log output directly into the VGA buffer or to a serial | |
| 10 | port. | |
| 11 | ||
| 12 | This is useful for kernel debugging when your machine crashes very | |
| 13 | early before the console code is initialized. For normal operation | |
| 14 | it is not recommended because it looks ugly and doesn't cooperate | |
| 15 | with klogd/syslogd or the X server. You should normally N here, | |
| 16 | unless you want to debug such a crash. | |
| 17 | ||
| 18 | config DEBUG_STACKOVERFLOW | |
| 19 | bool "Check for stack overflows" | |
| 20 | depends on DEBUG_KERNEL | |
| dab175f3 AB |
21 | help |
| 22 | This option will cause messages to be printed if free stack space | |
| 23 | drops below a certain limit. | |
| 1da177e4 | 24 | |
| 1da177e4 LT |
25 | config DEBUG_STACK_USAGE |
| 26 | bool "Stack utilization instrumentation" | |
| 27 | depends on DEBUG_KERNEL | |
| 28 | help | |
| 29 | Enables the display of the minimum amount of free stack which each | |
| 30 | task has ever had available in the sysrq-T and sysrq-P debug output. | |
| 31 | ||
| 32 | This option will slow down process creation somewhat. | |
| 33 | ||
| 4d7d8c82 CE |
34 | config STACK_BACKTRACE_COLS |
| 35 | int "Stack backtraces per line" if DEBUG_KERNEL | |
| 36 | range 1 3 | |
| 37 | default 2 | |
| 38 | help | |
| 39 | Selects how many stack backtrace entries per line to display. | |
| 40 | ||
| 41 | This can save screen space when displaying traces. | |
| 42 | ||
| 1da177e4 LT |
43 | comment "Page alloc debug is incompatible with Software Suspend on i386" |
| 44 | depends on DEBUG_KERNEL && SOFTWARE_SUSPEND | |
| 45 | ||
| 46 | config DEBUG_PAGEALLOC | |
| 4a2f0acf | 47 | bool "Debug page memory allocations" |
| a7d06ca7 | 48 | depends on DEBUG_KERNEL && !SOFTWARE_SUSPEND && !HUGETLBFS |
| 1da177e4 LT |
49 | help |
| 50 | Unmap pages from the kernel linear mapping after free_pages(). | |
| 51 | This results in a large slowdown, but helps to find certain types | |
| 52 | of memory corruptions. | |
| 53 | ||
| 63aaf308 AV |
54 | config DEBUG_RODATA |
| 55 | bool "Write protect kernel read-only data structures" | |
| 56 | depends on DEBUG_KERNEL | |
| 57 | help | |
| 58 | Mark the kernel read-only data as write-protected in the pagetables, | |
| 59 | in order to catch accidental (and incorrect) writes to such const | |
| 60 | data. This option may have a slight performance impact because a | |
| 61 | portion of the kernel code won't be covered by a 2MB TLB anymore. | |
| 62 | If in doubt, say "N". | |
| 63 | ||
| 1da177e4 LT |
64 | config 4KSTACKS |
| 65 | bool "Use 4Kb for kernel stacks instead of 8Kb" | |
| 66 | depends on DEBUG_KERNEL | |
| 67 | help | |
| 68 | If you say Y here the kernel will use a 4Kb stacksize for the | |
| 69 | kernel stack attached to each process/thread. This facilitates | |
| 70 | running more threads on a system and also reduces the pressure | |
| 71 | on the VM subsystem for higher order allocations. This option | |
| 72 | will also use IRQ stacks to compensate for the reduced stackspace. | |
| 73 | ||
| 74 | config X86_FIND_SMP_CONFIG | |
| 75 | bool | |
| 76 | depends on X86_LOCAL_APIC || X86_VOYAGER | |
| 77 | default y | |
| 78 | ||
| 79 | config X86_MPPARSE | |
| 80 | bool | |
| 81 | depends on X86_LOCAL_APIC && !X86_VISWS | |
| 82 | default y | |
| 83 | ||
| 84 | endmenu |